Improvement in chimney-caps



UNITED STATES PATENT OEEIcE.

WILLIAM CREUTZFELDT, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN CHlMNEY-CAPS.

Specification forming part of Letters Patent No. 5,356, dated November 6, 1847.

To all whom, it may concern.-

Be it known thatl, WILLIAM CREU'IZFELDT, of the city and county of Washington, in the District of Columbia, have invented new and useful Improvements in Chimney-Caps, Ventilators, dce.; and ldo hereby declare that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before known, and of the manner of making, constructing, and using the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of the cap on a chimney; Fig. 2, an elevation of the revolving spiral wings with the outer case removed; Fig. 3, a perspective view of said wings, and Fig. 4 a plan thereof.

The same letters indicate like parts in all the figures.

The nature of my invention consists in furnishing a smoke or Ventilating ue with an apparatus that shall canse a current constantly up said iiue by means of inclined revolving wings that are put in motion by the wind when blowing from any quarter without a directing-vane or other apparatus that is always liable to be blown down by a high wind.

The construction is as follows: A plate b is made to cover the top of the flue, having a circular hole through its center the size of the revolving wings. To this plate is affixed a frame ct, consisting of two upright posts andA a cross-piece at top and bottom directly over the center of the hole through the plate above named. In these cross-pieces of the frame are the bearings for an upright shaft, on which spiral wings c are fixed.` These wings are set at an angle of sixty degrees, more or less, and their upper ends may be made to run parallel with the shaft, as is clearly shown in Fig. 2. These upper parts ot' the Wings are concave. The lower parts are plain and are surrounded bya cylindrical case d, which revolves with them. On the'outside of this cylinder d spiral vanes or wings c are attached, projecting out'r'adially and standing at an angle of about si-Xty degrees, more or less. The upper ends of these wings are curved into concave form to facilitate the action of the wind on them. A wind from any quarter will cause a cap thus constructed to revolve, by which an upward current is drawn through the iiue by means of the spiral wings Within the cylinder.

That I claim as my invention, and desire to secure by Letters Patent, is-

The revolving chimney cap constructed substantially as herein described, having spiral wings placed over a ilue within a short cylindrical case, on the outside of which are wings acted on bythe Wind, by which the Whole are caused to revolve whenlthe wind is in any quarter without a directing-vane, as above specified.

WV. CREUTZFELDT.

Witnesses:

J. J. GEEENOUGII, B. FRANKLIN GASTON. 

